Remove ad-hoc testing scripts and artifacts from repository

[Copilot]

Repository root contained 25 testing files: manual test scripts with hardcoded production credentials and temporary output artifacts (JSON dumps, SQL snippets, Python scripts).

Changes

Removed files (25):

• 17 ad-hoc testing PowerShell scripts (test-*.ps1, check-*.ps1, send-*.ps1, etc.)
• 8 testing artifacts (sync-response.json, complement-test-output.txt, credentials.json, fix_join.py, jq filters, SQL snippets)

Retained:

• Server startup utilities (start-server.ps1, start-server.bat/sh)
• Build tools (gradlew.bat)
• Legitimate test framework (compliance-tests/)

Updated .gitignore:

# Testing artifacts and temporary files (do not commit)
test-*.ps1
check-*.ps1
send-*.ps1
*.sql
fix_*.py
jq_*.txt
*-response.json
*-output.txt
credentials.json

Security

Removes hardcoded production credentials and access tokens from repository history going forward.

Original prompt

clean up this repo. It has lots of log files and testing ps1 files which should probably at best be used to inform any unit tests what aren't already in our framework.

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